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Re: [Linux-cluster] GFS-Cluster and Virtualization



Theoretically, you could use GFS to let your VMs running Linux access the same storage on one system also. It depends on whether VMWare will allow the separate VMs use the same storage device for GFS.

Also remember that with clustering like GFS, your weakest link is your downfall. Most likely you are implementing virtualization to mitigate the problems security compromises can cause. Also realize that if the rootkits start attacking GFS, or cause locking problems with the module(s) they insert, there could be corruption in that instance. Someone please correct me if I am wrong.

If you are looking for load leveling, you might want to take a look at OpenSSI (which uses GFS and/or CFS) and (in the future) XEN. From what I see, OpenSSI already can move processes from one node to another for load leveling, and makes allowances for the "home node" of a process to fail without losing service from that process. XEN has future plans to move VMs between nodes, but does not do it yet AFAIK.

Mike

Thomas Liesner wrote:

Hi all,

i'm currently doing some kind of research about cluster-technology for
io-intensive applications like file- and printserver in prepress-
eviroments. As a total newby to cluster-concepts i was wondering if i
could do something like the following with gfs (or other cluster
technologies):

Several servers acting as one "superserver" hosting some virtualization
technology like VMWare. All cluster nodes would use the same shared
storage connected via fibrechannel to a fc-switch (This is exactly what
gfs is doing, right?) The virtual machines on this host would run
standard linux distributions like RedHat ES 4. Especially charming would
be the ability to grant storage and cpu needs between the  virual
machines "on demand".

1. Is it possible?
2. Would i run into io-problems (locking etc)?
3. Where could i find concepts of such installations with benchmarks and
reliability tests?

Thanks for any help,
./Tom




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